SPINODAL DECOMPOSITION OF PRECIPITATION HARDENING Fe-17Cr-4Ni-4Cu STAINLESS STEEL AT 475 °C

被引：1

作者：

Ma, Xue ^{[1
]}

Wang, Zhijun ^{[2
]}

Tong, Xuezhu ^{[1
]}

Du, Xaoming ^{[1
]}

Li, Tianfu ^{[2
]}

Liu, Rongdeng ^{[2
]}

Liu, Yuntao ^{[2
]}

Chen, Dongfeng ^{[2
]}

机构：

[1] Shenyang Ligong Univ, Sch Mat Sci & Engn, Shenyang, Peoples R China

[2] China Inst Atom Energy, Beijing, Peoples R China

来源：

MATERIALI IN TEHNOLOGIJE | 2022年 / 56卷 / 02期

基金：

国家重点研发计划;

关键词：

stainless steel; age hardening; spinodal decomposition; Cu-rich phase; RESOLUTION ELECTRON-MICROSCOPY; ATOM-PROBE; EMBRITTLEMENT; TEMPERATURE; FRACTURE;

D O I：

10.17222/mit.2021.336

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructure evolution and mechanical properties in an Fe-17Cr-4Ni-4Cu alloy aged at 475 degrees C after different aging times were studied. Conventional transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) studies revealed the formation of 9R-structure Cu-rich precipitates and Cr-rich alpha' phase by spinodal decomposition in the samples aged at 475 degrees C after 100-1000 h. The fine Cu-rich precipitates and Cr-rich alpha' phase by spinodal decomposition lead to a significant increase in the hardness, together in the early stages (100 h). Continued aging to 500 h leads to increased precipitation of the Cr-rich alpha', which provides significant strengthening, reaching maximum hardening, despite the continued loss of hardening by weakening by the Ostwald ripening of the Cu-rich precipitates. Extending the aging time to 1000 h leads to substantial reversed austenite transformation and a large number of ripening epsilon-copper precipitates that causes softening. The results of the impact tests showed that the major fracture mode was cleavage and/or quasi-cleavage.

引用

页码：193 / 199

页数：7

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